ios - why Reloading collection view in another class will cause Fatal Error in Swift 3? -


i have collection view in app in 1 class - have camera function in class want when take picture function execute in collection view class , want reload data in collection view cause fatal error 

here camera class codes  func imagepickercontroller(_ picker: uiimagepickercontroller, didfinishpickingmediawithinfo info: [string : any]) {      let selectedimage = info[uiimagepickercontrolleroriginalimage] as! uiimage      uiimagewritetosavedphotosalbum(selectedimage,self,nil,nil)       oneviewcontroller().reloading()      print("save image ")      dispatchqueue.main.asyncafter(deadline: .now() + .seconds(3), execute: {          self.dismiss(animated: true, completion: nil)                   })

and here oneview controller reloading function 

public func reloading() {      print("oky")               viewdidload()             viewwillappear(true)              let allphotosoptions : phfetchoptions = phfetchoptions.init()             allphotosoptions.sortdescriptors = [nssortdescriptor(key: "modificationdate", ascending: true)]             let allphotosresult = phasset.fetchassets(with: .image, options: allphotosoptions)             allphotosresult.enumerateobjects({ (asset, idx, stop) in                  let arry_img = nsmutablearray()                  self.arry_img.add(asset)                 self.arr_img = arry_img                  self.collview.reloaddata()              })  }


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